Effects of electron bombardment on the structural and mechanical properties of glass: insights from Vickers Microhardness testing
摘要
This work studies the effects of the electron bombardment on the structural, in addition to the mechanical, properties with a focus on changes in hardness and fracture behavior of float glass by the use of an electron gun, which is based on thermoelectronic emission, operating in a vacuum chamber. The glass samples about (0.2 and 1.5) mm in thickness, were irradiated, using accelerated electrons that had a fluence of 1015 e/cm2. The effect of electron irradiation was analyzed by Vickers microhardness tests, applying a force in the range of 0.5–1 N to such a sample, and the obtained indentations were examined by optical microscopy. The results show a significant reduction in hardness, accompanied by surface cracking and discoloration in the irradiated samples, indicating material embrittlement due to the accumulation of internal stresses. However, the hardness decrease, fracture toughness increased, suggesting that electron irradiation activates local plastic deformation mechanisms without altering the chemical composition of the glass. The information acquired is helpful for improving the design and engineering of glass products that are likely to be used in high radiation environments such as areas within electronics or as materials, or as components of the radiation shield including integration within devices, and indicates that the irradiation-induced effects need to be considered when selecting and assessing of structural materials for performance.